The third Antelope (PGM--86)----a high-speed, aluminum-hulled, motor gunboat, was laid down on 1 June 1965 at Tacoma,
Wash., by the Tacoma Boatbuilding Co., Inc.; launched on 18 June 1966; sponsored by Mrs. Paul V. Snow, the wife of the
Deputy Counsel of the Naval Ships Systems Command; reclassified a patrol gunboat on 28 March 1967 and simultaneously
redesignated PG--86; and commissioned on 4 November 1967, Lt. Jon Jared Gershon in command.

Following fitting out at Tacoma, Antelope moved to her first home port, San Diego, whence she conducted shakedown
training and operational tests before entering the Long Beach Naval Shipyard for post-shakedown availability. She then
spent most of the remaining months of 1968 in operations along the west coast. Late in the year, she prepared to conduct
CNO Project CS--48, evaluating new gunfire control equipment.

The gunboat completed this assignment in April 1969 and then entered the Long Beach Naval Shipyard for an overhaul to
bring her back to top trim and to enhance her ability to carry out her primary missions: off-shore patrol, control of coastal
traffic through high-speed interdiction, and close-in naval gunfire support for friendly forces ashore. When this work had
been finished, she conducted refresher training out of San Diego before departing that port on 2 November and proceeding
to the Marianas in company with Ready (PG--87) and Seminole (LKA--104). After stops at Pearl Harbor and Midway, the
ship arrived at Apra Harbor, Guam--her new home port--on 26 November. The next day, she began a restricted availability
at the ship repair facility there. During the week, numerous improvements were made to her installed systems before she
headed for Vietnamese waters on 19 January 1970.

Reaching Cam Ranh Bay on the 28th, Antelope began SEA-FLOAT operations on the Cua Lon River consisting of "night
harassment and interdiction gunfire; area fire preparatory to, and suppression fire during, troop sweeps; and mobile naval
gunfire support for friendly forces under ambush." On the last day of January, her guns assisted three ambushed Allied
inshore patrol craft. A fortnight later, after she had bombarded both ends of the Rach Bien Nhan Canal to prepare for an
Allied advance, UDT swimmers went ashore and learned that her gunfire had destroyed 19 communist bunkers, 11
buildings, and 26 cisterns.

On 15 February, Ready relieved Antelope, freeing her to return to Cam Ranh Bay for upkeep. On the 23d, the gunboat got
underway for a brief stint of "Market Time" duty. Such service entailed stopping, boarding, and inspecting all vessels that
she encountered to eliminate all waterborne logistical support of communist forces fighting in Vietnam. She returned to
SEAFLOAT on the 28th and, on 2 March, while supporting sweeps ashore by friendly troops, received about 10 rounds of
hostile, but harmless, small-arms fire, A week later, while shelling communist bunkers, she sighted and destroyed ". . . two
heavily loaded sampans fleeing down a canal."

Next came more "Market Time" duty, this time in the Gulf of Siam. There, besides serving as the command center for
Coastal Division 11, she sent inspection parties on hoard over 350 sampans and junks between 20 March and 2 April, On the
latter date, the ship resumed Operation SEAFLOAT. Three days later, she was ambushed on the Cua Lon River by a rocket
patrol which fired six B--40 rockets at the ship from less than 100 yards. Antelope immediately opened fire with all her
weapons and drove the enemy off before any casualties or serious damage to the ship occurred.

From 10 through 13 April, the gunboat left the rivers and entered the South China Sea to support a force of Montagnard
troops landing on and sweeping through communist-held territory. During the operation, her boat evacuated 115 men.
Thereafter, the warship conducted gunfire support missions until the 17th when she ended 31 consecutive days underway
and headed for Cam Ranb Bay and brief upkeep.

On 25 April, Antelope returned to SEAFLOAT duty. About an hour past midnight on 4 May, an explosion on her starboard
side amidships jarred the gunboat. Investigation soon revealed a 5-inch hole in her main deck, probably caused by ". . . a
satchel charge catapulted from the north bank of the Cua Lon." However, no casualties or interior damage from the blast
resulted. Five days later, while the vessel was descending the river to enter the South China Sea, communist forces lying in
ambush fired at least six B-40 rockets at her. Her alert gun crew returned the fire while the first three rockets were still
airborne." Antelope suffered no hits or damage. Again, on the 11th, while fighting off a launch bomb attack from an ambush
site on the bank of the Bo De, she drove the communist troops from their weapons and sent a landing party ashore which
captured eight bomb launchers, four launch bombs, and several B--40 rockets.

After four days of upkeep at Cam Ranh Bay, the ship got underway for special operations in the Gulf of Siam and troop
support in Cambodia. At the end of May, she resumed SEA-FLOAT duties, but a failure of her number one main engine
soon forced her back to Cam Ranh Bay for repairs.

On 11 June, she proceeded north to play the part of a communist high-speed patrol boat attacking an Allied task force with
missiles, guns, and torpedoes in Exercise "Beacon Tower II" in the Gulf of Tonkin. She then visited Hong Kong before
returning to Guam on 3 August. There she underwent a restricted availability which lasted until 18 January 1971.

The next day, she sailed for the Philippines. After a brief stop at Subic Bay, she pushed on back to Vietnamese waters where
she arrived on the 1ast day of January and began "Market Time" duty in the Gulf of Thailand. As on her first deployment to
Vietnam, her service in checking infiltration was again interrupted by upkeep and occasional naval gunfire support missions.

She headed back toward the Marianas on 24 April. En route to Guam, she visited Keelung and Kaohsiung, Taiwan, and
Subic Bay before arriving at Apra Harbor on 18 May. Meanwhile, she had been assigned a new home port, Long Beach,
Calif.; and, on the 30th, she sailed for that base which she reached on 18 June. On the last day of that month, she entered the
Long Beach Naval Shipyard for overhaul and alterations.

The yard work, which gave the ship an interim surface-to-surface missile capability, lasted until 31 January 1972. Antelope
spent the next few months in independent exercises; fire control system antenna collimation; missile firing; and receiving new
main diesel engines, additional communications equipment, and self-synchronizing clutches.

On 10 July, the gunboat began preparations for a transfer to the Atlantic Fleet. A fortnight later, she got underway in
company with Ready and Barnstable County (LST--1197) and proceeded via Acapulco, Mexico, to the Isthmus of Panama.
She transited the canal on 7 August and reached Little Creek, Va., on the l4th. On 30 August, she, Ready, and Graham
County (AGP--1 176) sailed for the Mediterranean. On 1 September, Antelope's home port was changed to Naples, Italy.
Following stops at Ponta Delgada, Azores, and at Rota, Spain, the warships reached Naples on the 17th. Antelope's
operations for the remainder of the year included missile handling exercises at Augusta Bay, Sicily; ROMAR simulation
operations with Task Group (TG) 60.2; NATO Exercise "National Week XIV"; her firing of a missile with a warhead; a visit
to Izmir, Turkey; and special warfare operations at Souda Bay, Crete.

The gunboats service in 1973 was much like that which she had performed during her last three months of 1972. Highlights
during the first six months were: an amphibious exercise at the Monte Romano Training Anchorage from 24 to 29 January
and a visit to Monaco during the following week; "National Week XV" Exercise from 19 to 24 February; towing ITASS
sonic test device late in February; an amphibious exercise at Portoscuso, Sardinia, and a visit to Bizerte, Tunisia, in April; a
missile tracking exercise at Souda Bay at the end of May, NATO Exercise "Dawn Patrol 73" in June; and bilateral
operations with Greek fast patrol boats which continued from 21 July to 10 August. During the latter half of the year, she
took part in international Operation "Zeus" in the vicinity of Thasos Island, Greece, from 21 to 29 August and NATO
Exercise "Deep Furrow 73" from 20 to 30 September, before firing a missile off Crete on 1 October. This shot scored a
direct hit on a Mk 35 SEPTAR target boat and was the first successful firing in the Mediterranean of the telemetered
standard surface-to-surface missile system.

The ship visited Barcelona, Spain, in mid-January 1974; took part in amphibious exercises at Gythion, Greece, from 3 to 10
February; and participated in Exercise "National Week XVI" from 13 to 21 February. Next, she devoted more than four
months to an overhaul in a private shipyard at Naples.

A short visit to Souda Bay, Crete; surveillance operations in the western Mediterranean; and visits to Malaga, Spain, took
up most of July. Then, after a stop at the Spanish island of Majorca in the Balearics from 29 July to 1 August, she remained
at Naples from 4 to 20 August and then returned to Spain for visits to Cartagena and Malaga before putting to sea on 31
August for a fortnight of surveillance operations in the western Mediterranean. Exercise "Flintlock 74" out of Venice lasted
from 3 to 17 October. Antelope next returned to Naples and remained there until getting underway early in February 1975
for missile exercises. Thereafter, during more than two years, her operations spanned the Mediterranean from east to west
and from southern Europe to the shores of North Africa. She left the "Middle Sea" in August 1975 for a brief visit to
Casablanca, Morocco.

Her subsequent missions during this latter part of her service with the 6th Fleet were quite like those she had already
performed. She visited many of the same ports; took part in similar exercises; and, between 10 January and 7 May 1976,
underwent another overhaul at Naples. On 1 April 1977, she was reassigned to Nisida Island as her home port.

Her deployment to European waters ended on the last day of July 1977, and she departed Rota, Spain, bound for home.
Following stops in the Azores and at Bermuda, she reached Little Creek on 21 August and was decommissioned there on 1
October 1977. She was transferred to the Environmental Protection Agency on 17 January 1978 and was placed in service
on Lake Michigan as a survey vessel gathering data to determine the impact of waste disposal upon the Great Lakes.